{"id":12806,"date":"2023-11-28T23:06:41","date_gmt":"2023-11-28T15:06:41","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=12806"},"modified":"2023-11-29T21:37:36","modified_gmt":"2023-11-29T13:37:36","slug":"javascript-zhong-yun-suan-fu-neng-zuo-shen-me-2","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/javascript-zhong-yun-suan-fu-neng-zuo-shen-me-2\/","title":{"rendered":"JavaScript \u4e2d| |\u8fd0\u7b97\u7b26\u80fd\u505a\u4ec0\u4e48\uff1f"},"content":{"rendered":"<p>\u5728 JavaScript \u4e2d\uff0c<code>||<\/code> \u662f\u903b\u8f91\u6216\uff08OR\uff09\u8fd0\u7b97\u7b26\uff0c\u5b83\u7528\u4e8e\u5bf9\u4e24\u4e2a\u64cd\u4f5c\u6570\u8fdb\u884c\u903b\u8f91\u201c\u6216\u201d\u8fd0\u7b97\u3002<code>||<\/code> \u8fd0\u7b97\u7b26\u5177\u6709\u4ee5\u4e0b\u7279\u6027\u548c\u7528\u9014\uff1a<\/p>\n<ol>\n<li>\n<p><strong>\u903b\u8f91\u6216\u8fd0\u7b97\uff1a<\/strong> \u5f53\u7528\u4e8e\u4e24\u4e2a\u64cd\u4f5c\u6570\u65f6\uff0c\u5982\u679c\u5176\u4e2d\u4efb\u4f55\u4e00\u4e2a\u64cd\u4f5c\u6570\u4e3a\u771f\uff08truthy\uff09\uff0c\u5219\u8fd4\u56de\u7b2c\u4e00\u4e2a\u771f\u503c\u64cd\u4f5c\u6570\uff1b\u5982\u679c\u4e24\u4e2a\u64cd\u4f5c\u6570\u90fd\u4e3a\u5047\uff08falsy\uff09\uff0c\u5219\u8fd4\u56de\u6700\u540e\u4e00\u4e2a\u5047\u503c\u64cd\u4f5c\u6570\u3002\u5b83\u4e0d\u4ec5\u8fd4\u56de\u5e03\u5c14\u503c\uff0c\u8fd8\u53ef\u4ee5\u8fd4\u56de\u4efb\u4f55\u7c7b\u578b\u7684\u503c\u3002<\/p>\n<pre><code class=\"language-javascript\">let a = 5 || 0; \/\/ \u8fd4\u56de 5\uff0c\u56e0\u4e3a 5 \u662f\u771f\u503c\nlet b = '' || 'default'; \/\/ \u8fd4\u56de 'default'\uff0c\u56e0\u4e3a '' \u662f\u5047\u503c\uff0c'default' \u662f\u771f\u503c\nlet c = false || true; \/\/ \u8fd4\u56de true\uff0c\u56e0\u4e3a true \u662f\u771f\u503c\n<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>\u9ed8\u8ba4\u503c\u8bbe\u5b9a\uff1a<\/strong> \u53ef\u7528\u4e8e\u8bbe\u5b9a\u9ed8\u8ba4\u503c\u3002\u5f53\u9700\u8981\u7ed9\u53d8\u91cf\u8d4b\u9ed8\u8ba4\u503c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>||<\/code> \u8fd0\u7b97\u7b26\u3002<\/p>\n<pre><code class=\"language-javascript\">let username = inputUsername || 'Guest'; \/\/ \u5982\u679c inputUsername \u4e3a\u5047\u503c\uff0c\u5219\u4f7f\u7528 'Guest' \u4f5c\u4e3a\u9ed8\u8ba4\u503c\n<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>\u77ed\u8def\u6c42\u503c\uff1a<\/strong> \u5728\u8fdb\u884c\u903b\u8f91\u6216\u8fd0\u7b97\u65f6\uff0c\u5982\u679c\u7b2c\u4e00\u4e2a\u64cd\u4f5c\u6570\u4e3a\u771f\uff0c\u5219\u4e0d\u4f1a\u518d\u5bf9\u7b2c\u4e8c\u4e2a\u64cd\u4f5c\u6570\u8fdb\u884c\u6c42\u503c\u3002\u8fd9\u88ab\u79f0\u4e3a\u77ed\u8def\u6c42\u503c\u3002<\/p>\n<pre><code class=\"language-javascript\">let result = true || someFunction(); \/\/ \u5982\u679c\u7b2c\u4e00\u4e2a\u64cd\u4f5c\u6570\u4e3a\u771f\uff0c\u5219\u4e0d\u4f1a\u6267\u884c someFunction()\uff0c\u76f4\u63a5\u8fd4\u56de true\n<\/code><\/pre>\n<\/li>\n<\/ol>\n<p><code>||<\/code> \u8fd0\u7b97\u7b26\u5728 JavaScript \u4e2d\u662f\u4e00\u79cd\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u80fd\u591f\u7b80\u5316\u6761\u4ef6\u8d4b\u503c\u3001\u8bbe\u5b9a\u9ed8\u8ba4\u503c\u7b49\u5e38\u89c1\u573a\u666f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 JavaScript \u4e2d\uff0c|| \u662f\u903b\u8f91\u6216\uff08OR\uff09\u8fd0\u7b97\u7b26\uff0c\u5b83\u7528\u4e8e\u5bf9\u4e24\u4e2a\u64cd\u4f5c\u6570\u8fdb\u884c\u903b\u8f91\u201c\u6216\u201d\u8fd0\u7b97\u3002|| \u8fd0\u7b97\u7b26 [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[115],"tags":[],"class_list":["post-12806","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12806","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=12806"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12806\/revisions"}],"predecessor-version":[{"id":13515,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/12806\/revisions\/13515"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=12806"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=12806"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=12806"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}